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SYNTHESIS AND PROPERTIES OF NOVEL POLY(IMINO KETONE)S AS HIGH-PERFORMANCE POLYMERS 被引量:11
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作者 Chang, Guan-jun Luo, Xuan +1 位作者 Zhang, Lin Lin, Run-xiong 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2008年第1期55-61,共7页
Di(4-bromophenyl)ketone and various aromatic diamines as the monomers,a series of novel poly(imino ketone)s (PIKs)have been synthesized via palladium-catalyzed aryl amination,which is Hartwig-Buchwald polycondensation... Di(4-bromophenyl)ketone and various aromatic diamines as the monomers,a series of novel poly(imino ketone)s (PIKs)have been synthesized via palladium-catalyzed aryl amination,which is Hartwig-Buchwald polycondensation reaction.The structures of PIKs are characterized by means of elemental analysis,FT-IR,~1H-NMR and UV-Vis spectroscopy. The results show a good agreement with the proposed structure.The general properties of PIKs are studied by DSC,TG and wide-angle X-ray diffraction,the solubility behavior is... 展开更多
关键词 Di(4-bromophenyl)ketone Aromatic diamines Palladium-catalyzed aryl amination High-performance Poly(imino ketone)
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A new package:MySAS for small angle scattering data analysis 被引量:3
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作者 Huang Chaoqiang Xia Qingzhong +2 位作者 Yan Guanyun Sun Guang'ai Chen Bo 《Nuclear Science and Techniques》 SCIE CAS CSCD 2010年第6期325-329,共5页
In this paper,A MySAS package,which is verified on Windows XP,can easily convert two-dimensional data in small angle neutron and X-ray scattering analysis,operate individually and execute one particular operation as n... In this paper,A MySAS package,which is verified on Windows XP,can easily convert two-dimensional data in small angle neutron and X-ray scattering analysis,operate individually and execute one particular operation as numerical data reduction or analysis,and graphical visualization.This MySAS package can implement the input and output routines via scanning certain properties,thus recalling completely sets of repetition input and selecting the input files.On starting from the two-dimensional files,the MySAS package can correct the anisotropic or isotropic data for physical interpretation and select the relevant pixels.Over 50 model functions are fitted by the POWELL code using x^2 as the figure of merit function. 展开更多
关键词 数据分析 小角散射 WINDOWS 二维数据 重复输入 输入文件 X射线散射 数据还原
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Neutron response functions and detection efficiency of a spherical proton recoil proportional counter 被引量:2
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作者 Wang Xinhua He Tie +4 位作者 Guo Haiping An Li Zhen Pu Mou Yunfeng Yang Jian 《Nuclear Science and Techniques》 SCIE CAS CSCD 2010年第6期330-333,共4页
The neutron response function and detection efficiency of a spherical proton recoil proportional counter (SP) play key roles in precise measurement of neutron spectra of the interior materials.In this paper,the respon... The neutron response function and detection efficiency of a spherical proton recoil proportional counter (SP) play key roles in precise measurement of neutron spectra of the interior materials.In this paper,the response functions and detection efficiency of three SPs developed at CAEP are simulated by Geant4.The simulated spectra are compared with pulse-height spectra measured at 0.165,0.575,1.4,and 14.1 MeV of incident neutrons.And the calculated detector efficiencies agree within 5%with the data obtained by neutron activation. 展开更多
关键词 正比计数器 响应函数 探测效率 反冲质子 中子谱 球形 GEANT4 检测效率
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STUDY ON THE EFFECTS OF TLCP ON PYROLYSIS OF PET AND ITS RETARDANT MECHANISM 被引量:1
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作者 Deng, Yi Wang, Yu-zhong +2 位作者 Zong, Zhi-jing Liu, Xiu-hua Du, Xiao-hua 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2008年第1期111-116,共6页
The flame retardancy of aromatic thermotropic liquid crystal phosphorus-containing copolyester,TLCP,on PET was investigated.The results show that the presence of TLCP promotes char formation of the substrate and enhan... The flame retardancy of aromatic thermotropic liquid crystal phosphorus-containing copolyester,TLCP,on PET was investigated.The results show that the presence of TLCP promotes char formation of the substrate and enhances thermal stability of char,hence delay its decomposition.SEM pictures show that the char formed from PET/TLCP is more compact, therefore is more resistant to fire and heat than that from pure PET.Evolved gas analysis by I.R measurements indicates that TLCP would decompose to produce phosphor... 展开更多
关键词 Thermotropic liquid crystal copolymer Flame retardant PET
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Ab initio Study on the Molecular Geometry, Electronic Structure and Thermodynamic Properties of Benzotrifuroxan(BTF)
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作者 Gong, XD Xiao, HM Dong, HS 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 1999年第2期49-55,共7页
The molecular geometries and electronic structures of two isomers of benzotrifuroxan (BTF) have been studied using ab initio molecular orbital method at the HF/6 31G * level. The calculated results show that the... The molecular geometries and electronic structures of two isomers of benzotrifuroxan (BTF) have been studied using ab initio molecular orbital method at the HF/6 31G * level. The calculated results show that the hexanitroso isomer has much higher energy than the tetracyclic form and is unstable. Infrared frequencies have been calculated for the stable tetracyclic structure and scaled by 0.89. The scaled frequencies agree well with the available experimental results, and have been used to derive the standard thermodynamic functions, heat capacity( Cp °), entropy( S °) and enthalpy( H° H 298 °). 展开更多
关键词 benzotrifuroxan(BTF) ab INITIO MO method MOLECULAR GEOMETRY ELECTRONIC STRUCTURE IR frequency THERMODYNAMIC property
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冷旋U-6.5Nb合金再结晶晶粒长大的实验研究
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作者 张新建 汪小琳 +1 位作者 罗超 周南强 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2010年第10期1815-1819,共5页
采用冷旋加工-退火工艺细化U-6.5Nb合金晶粒组织,研究旋压变形率、退火温度及退火时间对再结晶后晶粒组织的影响。结果表明,在研究范围内,旋压变形率对晶粒尺寸没有显著影响,随退火温度的升高和退火时间的延长,晶粒尺寸不断长大。在700,... 采用冷旋加工-退火工艺细化U-6.5Nb合金晶粒组织,研究旋压变形率、退火温度及退火时间对再结晶后晶粒组织的影响。结果表明,在研究范围内,旋压变形率对晶粒尺寸没有显著影响,随退火温度的升高和退火时间的延长,晶粒尺寸不断长大。在700,800和900℃保温过程中的晶粒长大指数分别为0.47,0.31和0.34,晶粒长大激活能为100.4kJ/mol,表明U-6.5Nb合金的晶粒长大受Nb原子的扩散控制。 展开更多
关键词 合金再结晶 晶粒长大指数 实验研究 GRAIN Growth 退火温度 退火时间 晶粒组织 晶粒尺寸 变形率 旋压 退火工艺 扩散控制 激活能为 温度及 原子 升高 结果 加工 过程 保温
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Fabrication of the Coatings for the High-temperature Oxidation Resistance on Hydrogen Resistance Steel
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作者 Yang Wenmao Luo Yuwen +5 位作者 Wu Zhiyong Li Shanzhen Li Chang'an Li Xueyuan Du Wen-Hao Chen Binzhou 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2012年第S1期124-127,共4页
Alumina coating is used to improve the performance of high-temperature oxidation resistance,which can be fabricated on the surface of hydrogen resistance steel by two methods,thermal oxidation of arc ion plated Al coa... Alumina coating is used to improve the performance of high-temperature oxidation resistance,which can be fabricated on the surface of hydrogen resistance steel by two methods,thermal oxidation of arc ion plated Al coating and reactive magnetron sputtering.Elemental composition,structures and surface morphologies of the coating were analyzed and compared in this paper.The surface of the coatings,which was made by the first method,was composed of α-Al2O3 phase and internal was Fe-Al alloy phase.The Alumina coatings made by the second method were amorphous.In addition,appearances of Alumina coatings fabricated by these two methods were quit different,which were grey and transparent respectively.Both of the two kinds of coatings meet to the needs of high-temperature oxidation resistance. 展开更多
关键词 ALUMINA HYDROGEN RESISTANCE steel OXIDATION RESISTANCE
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